[dev.link] cmd/internal/dwarf: add back some constant prefixes
[dev.link] cmd/internal/dwarf: add back some constant prefixes

They are still used by the old linker.

This is for introducing gating for the new object file format and
the new linker.

Change-Id: I97bb6ab4cc2c03f90f199c705d4c127e45ca07f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/224621
Run-TryBot: Cherry Zhang <d62e63aa42ce272d7b6a5055d97e942b33a34679@google.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Than McIntosh <4b2922593166fc595a9b1a408f34f5d3817fe9d2@google.com>

cloudflare/go,nawawi/go,akutz/go,cloudflare/go,akutz/go,akutz/go,nawawi/go,CAFxX/go,nawawi/go,golang/go,golang/go,cloudflare/go,CAFxX/go,CAFxX/go,akutz/go,CAFxX/go,golang/go,golang/go,cloudflare/go,nawawi/go,CAFxX/go,nawawi/go,cloudflare/go,CAFxX/go,nawawi/go,golang/go,akutz/go,akutz/go,golang/go,CAFxX/go,nawawi/go,cloudflare/go,cloudflare/go,nawawi/go,cloudflare/go,CAFxX/go,golang/go,golang/go,akutz/go,akutz/go